rust: deprecate the ittapi-rs crate

# Please enter the commit message for your changes. Lines starting
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# Date:      Wed Apr 6 11:15:13 2022 -0700
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# On branch deprecate-ittapi-rs
# Your branch is up to date with 'abrown/deprecate-ittapi-rs'.
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# Changes to be committed:
#	modified:   ittapi-rs/ittapi/Cargo.toml
#	new file:   ittapi-rs/ittapi/README.md
#	modified:   ittapi-rs/ittapi/src/lib.rs
#
